Instruction Manual for Three-Phase TTR …

1 AVTMTTR300. Rev B. Sept 2008. Instruction Manual for Three-Phase TTR . Transformer Turn Ratio Test Set TTR300 series Catalog Numbers. TTR300, TTR300-47. HIGH-VOLTAGE EQUIPMENT. Read this entire Manual before operating equipment M. Valley Forge Corporate Center 2621 Van Buren Avenue Norristown, PA 19403-2329. 610-676-8500. Copyright 2008 Megger. All rights reserved. The information presented in this Manual is believed to be adequate for the intended use of the product. The products described herein should not be used for purposes other than as specified herein. Specifications are subject to change without notice. WARRANTY. Products supplied by Megger are warranted against defects in material and workmanship for a period of one year following shipment. Our liability is specifically limited to replacing or repairing, at our option, defective equipment.

2 Equipment returned to the factory for repair must be shipped prepaid and insured. This warranty does not include batteries, lamps, or other expendable items, where the original manufacturer's warranty shall apply. We make no other warranty. The warranty is void in the event of abuse (failure to follow recommended operating procedures) or failure by the customer to perform specific routine maintenance as indicated in this Manual . M. Valley Forge Corporate Center 2621 Van Buren Ave Norristown, PA 19403-2329. 610-676-8500 (Telephone). 610-676-8610 (Fax). TABLE OF CONTENTS. 1 GETTING TO KNOW THE TTR300 ..5. Product Overview ..5. Top Panel Controls ..7. 2 SAFETY ..9. Safety is the responsibility of the General Safety Precautions ..9. Input Power 10. 3 PREPARING FOR TEST.

3 13. Site 13. Making Circuit Connections .. 13. 4 CONNECTING TO THE TRANSFORMER .. 15. Single-Phase, Two-Winding 16. Three-Phase , Two-Winding 19. Three-Phase , three -Winding transformers .. 20. Current transformers (CTs).. 20. T-Type transformers .. 27. 5 29. Power 29. Remote Control Operation for LTC 29. Error Messages .. 30. Upon completion of TEST Powering down .. 31. 6 SERVICE .. 33. Maintenance .. 33. Fuse Replacement .. 33. Calibration .. 34. TTR300 Self check .. 34. AVTMTTR300 Rev B Sept 2008 i M. Troubleshooting ..36. Repairs ..37. 7 REPLACEMENT PARTS LIST AND OPTIONAL ACCESSORIES ..39. 8 SPECIFICATIONS ..41. Electrical ..41. Environmental Conditions ..43. ADDENDUM A ..45. TTR 300 SERIES POWERDB LITE USER Manual ..45. Software Installation ..47. Using PowerDB Lite.

4 49. Frequently Asked Questions (FAQ's)..57. Specific Form Help instructions ..58. AVTMTTR300 Rev B Sept 2008. ii Table of Contents List of Figures Figure 4-1. Setup for Testing Single-Phase 16. Figure 4-2. Setup for Testing Single-Phase Autotransformer .. 17. Figure 4-3. Setup for Testing Single-Phase, Type A (Straight Design) Step Voltage Regulator .. 18. Figure 4-4. Setup for Testing Single-Phase, Type B (Inverted Design) Step Voltage Regulator .. 18. Figure 4-5. Setup for Testing Unmounted Current 22. Figure 4-6. Setup for Testing Taps on Multiple Tap CT .. 22. Figure 4-7. Setup for Testing BCT Mounted on Single-Phase Two-Winding Transformer .. 23. Figure 4-8. Setup for Testing BCT Mounted on Delta Winding on a Three-Phase Power 25. Figure 4-9. Setup for Testing BCT Mounted on Wye Winding of a Three-Phase Transformer.

5 26. LIST OF TABLES. Table 4-1. Test Lead Markings for Single-Phase transformers .. 17. Table 4-2. Test Lead Markings for Three-Phase transformers .. 19. Table 4-3. T-type Transformer Winding Phase Relationship .. 27. Table 6-1. Troubleshooting Guide .. 36. Table 7-1. Replacement Parts List .. 39. AVTMTTR300 Rev B Sept 2008. iii M. Upon Receipt of Product Prior to operation, check for loosened hardware or damage incurred during transit. If these conditions are found, a safety hazard is likely, DO NOT attempt to operate equipment. Please contact Megger as soon as possible. TTR300 Transformer Turn Ratio test set AVTMTTR300 Rev B Sept 2008. iv 1. Getting to know the TTR300. Product Overview The Three-Phase TTR Test Set is fully automatic, self-checking, unit which is designed to be controlled via a computer running either PowerDB or PowerDB.

6 Lite software programs. The test set measures the turn ratio, phase shift, and excitation current of power, distribution, and instrument transformers . A -47 . suffix added to the catalog number denotes a 230-V input power supply, rather than the standard 120-V supply. The test set is a portable instrument housed in a sturdy plastic case with removable lid and carrying strap. The inside lining of case is metal shielded. A canvas carrying bag is supplied to hold all accessories. The test set can be used to test single-phase and Three-Phase transformers , both with and without taps in accordance with the requirements of the IEEE. 1997 standards. For Three-Phase measurements, the test set is connected to all three phases of the transformer to be tested. The TTR lead selection circuitry permits automatic measurement of all phases without changing connections.

7 This feature eliminates the need to refer to hook-up charts when testing Three-Phase transformers . Transformer excitation current as well as phase shift angle helps to detect transformer shorted turns or an unequal number of turns connected in parallel. Operating condition (error) messages identify incorrect test connections, abnormal operating condition, or winding problems. Test results are saved to an external personal computer (PC) via an RS232 serial port. Features include: Fully automatic operation. Self-checking at power-up. User-friendly, menu-driven operation (via PC). AVTMTTR300 Rev B Sept 2008 5. M. Test turn ratio, phase shift (in both degree and centiradian), and excitation current. Easy measuring of regular windings, tertiary windings, and CTs. Checking reverse polarity at start of each test.

8 Via ethernet port, an external PC or laptop is connected to operate the TTR (in remote control mode) and to transfer test results and to provide full transformer test report. Quick test mode provides the fastest testing of a transformer. three excitation test voltages: 80 V, 40 V, and 8 V. Testing to ANSI, IEC, and Australian standards. Leads marked to ANSI, IEC, and Australian standards. Multi-lingual support. Meets the requirements of both the European EMC and Low Voltage Directives. It is recommended that the user becomes familiar with the TTR300 before ever connecting to a transformer. AVTMTTR300 Rev B Sept 2008. 6. Getting to Know the TTR300. Top Panel Controls 1. 7. 4 5. 3. 2 6. Figure 1-1. Top Panel Controls 1. Power input receptacle, ON/OFF switch, and fuse holder.

9 ON/OFF. power switch and input power receptacle provides power to the test set. 2. Emergency OFF switch. This red push button interrupts testing. When pressed, the switch is locked in off position. To reset the switch, twist the button in the direction indicated by the arrows. 3. Voltage ON light. Red indicator lamp indicates when lit that test voltage is being supplied to the Unit Under Test (UUT). 4. Remote Trigger receptacle. Plug receptacle for connecting Remote Trigger cable for testing transformers with Load-Tap-Changers. 5. H Cable receptacle. Plug receptacle for connecting test leads to the high- voltage (H) winding of a transformer 6. X Cable receptacle. Plug receptacle for connecting test leads to the low- voltage (X) winding of a transformer. 7. Ground lug.

10 Wing-nut terminal allows connection of test set to Station Earth ground. AVTMTTR300 Rev B Sept 2008. 7. M. M. AVTMTTR300 Rev B Sept 2008. 8. 2. Safety Safety is the responsibility of the user Only qualified and trained operators should operate the TTR300 system. Operator must read and understand this entire Instruction Manual prior to operating the equipment. Operator must follow the instructions of this Instruction Manual and attend the equipment while the equipment is in use. In the event of equipment malfunction, the unit should immediately be de- energized and returned to Megger for repair. The Safety precautions herein are not intended to replace your Company's Safety Procedures. Refer to IEEE 510 - 1983, IEEE Recommended Practices for Safety in High-Voltage and High- Power Testing, for additional information.